研究目的
To improve the weld strength of laser-welded joints via post-processing by warm laser shock peening (wLSP).
研究成果
Warm laser shock peening was an effective method of increasing joint strength of laser-welded joints. The use of a novel dual-laser setup for rapid heating and simultaneous wLSP is an industrially viable processing technique and can be used to rapidly improve the weld strength of in situ welded joints.
研究不足
The study focuses on AA6061-T6 and TZM alloys, and the results may not be directly applicable to other materials. The process requires precise control of temperature and laser parameters.
1：Experimental Design and Method Selection:
A dual-laser setup was utilized to simultaneously heat the sample to a prescribed temperature and to perform the wLSP process on the laser-welded joints of AA6061-T6 and TZM alloys.
2：Sample Selection and Data Sources:
Rolled sheets of AA6061-T6 with a thickness of 1–2 mm and hot rolled TZM alloy sheets with a thickness of
3：5–1 mm were used. List of Experimental Equipment and Materials:
IPG YLR-1000 fiber laser, Nd-YAG laser, continuous wave fiber laser (IPG YLR 150/1500 QCW), high-temperature silicone fluid, aluminum foil.
4：Experimental Procedures and Operational Workflow:
Laser welding was performed followed by wLSP processing. Tensile tests were carried out on processed samples.
5：Data Analysis Methods:
Finite element analysis was used to understand the effects of warm temperature and silicone oil confinement based laser shock pressure on the residual stresses.
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IPG YLR-1000 fiber laser
YLR-1000
IPG
Used for laser welding of AA6061-T6 and TZM alloys.
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Continuous wave fiber laser
IPG YLR 150/1500 QCW
IPG
Used to locally heat the workpiece to 425–500 K.
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Nd-YAG laser
Used for performing LSP.
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High-temperature silicone fluid
Used to produce a fluid confinement regime during wLSP.
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Aluminum foil
Used as the sacrificial layer during wLSP.
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